code: def _grad_post_processing(self, grad_var_list):
      normalized_grad_var_list = []
      for grad, var in grad_var_list:
          if "item_MLP" in var.name:
              normalized_grad_var_list.append(
                  (grad * (1.0 / self._batch_size), var)
              )
          else:
              normalized_grad_var_list.append((grad, var))
      return normalized_grad_var_list
  
file_path: openrec/openrec/tf1/legacy/recommenders/concat_visual_bpr.py
imports: from openrec.tf1.legacy.recommenders import BPR
  from openrec.tf1.legacy.modules.extractions import LatentFactor, MultiLayerFC
  from openrec.tf1.legacy.modules.fusions import Concat
label_desc: Use image node_id 6 for calling the ConcatVisualBPR obj's underlying member method code with example usage: obj._grad_post_processing(grad_var_list) and returns: normalized_grad_var_list